Transcript for 'Eat It to Beat It': How to Cut Calories in Smoothies, Frothy Drinks

And smoothies seem like a good option. But while smoothies quench your thirst, you could also be putting on the pounds. Dave zinczenko is here. I thought smoothies were healthy. You have to make sure you don't make blender blunders. It happens up being the combined 85 doughnuts. That's the sugar equivalent if you have smoothies packed with sugar and calories. 85 doughnuts? Just three drinks. We have smoothie rules. You want to make sure you downsize your cup. There's no reason to go with 32 ounces in a cup. Unless you're about to start the big game. Or there's a marathon pistol going off in two minutes. Then, drink the 32 ounces. Don't drive over 55. That's 55 grams of sugar. There's no reason you should have more than 55 grams of sugar in a smoothie. And number three, don't use a spoon. If you're using a spoon, it's dessert. Because it's so thick. Ah. Too much ice cream in there. Let's get to the drinks. We're starting here with smoothie king. This is the peanut power plus chocolate smoothie. The problem is it's over 1,000 calories. Almost 95 grams of sugar. It's on the fitness blend menu. If this is fitness blend, I don't know what the couch pate toe blend looks like. This is the sugar equivalent of eight bowls of foot loops. What you're going to do now -- What's the alternative. You're going to go almond mocha right here. This is 345 calories. And you're going to save 705 calories and 57 grams of sugar. That's a lot of savings. What's the next drink? I'm going to tropical smoothie cafe. This is the kiwi quencher. It's over 430 calories. And 100 grams of sugar. That means 400 calories from sugar in a 430 calorie drink. What's the equivalent? Sugar equivalent would be 21 1/2 oreos. That was Karen. Not Lara. What is the healthy version? We're going to do something crazy. Go to the kids menu. You're going to get the jetty junior. You're going to end up saving 240 calories. Nice. And 65 grams of sugar. A lot of sugar. What's our next drink? Orange Julius from dairy queen. The triple berry Orange Julius, it's 142 grams of sugar. What's the healthy alternative. Equivalent of 11 McDonald's apple pies. You have to lose anal apple pie. Go with the strawberry banana light option. It's a tropical island in a glass. Thank you. I don't know if I'll ever have one of these other smoothies again. But we reached out to all of the chains. They say they offer a healthy alternative so their customers can make an informed choice.

This transcript has been automatically generated and may not be 100% accurate.

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